These socks are knitted toe up.

The stitch pattern is relatively stretchy, which allows for many sizes.
The green and orange sample socks are size 40 EUR, the brown ones 43 EUR.

Although only one size (64 sts) is included in the pattern, on the leg part it is easy to add extra stitches to the sides of the chart or to the sides of the fake cables. To remove stitches, it is easiest to do so from the sides of the chart.

The brown socks on the pattern page have two added stitches on either side of the leg, and those extra stitches were purled in the cuff.